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Grid switch ratings enquiry

Farmboy
Had an interesting chat with a tech dept this afternoon after coming across some grid switches in a domestic kitchen.


Four grid switches (sharing a common backbox) are each fed via their own 16A cb's, and each feeds 1G sockets (for a cooker hood, fridge freezer, etc). Ignoring the cable sizes (the focus being on the grid switches), given the 13A plug fuses limits the loads in each cct, would you have the current rating of the grid switches equal to or higher than the 16A cb's (e.g. 20A), or lower (but equal to or higher than the socket rating e.g. 13A/14A)?


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    gkenyon:

    I've seen similar situations where the plug and socket-outlet are not overloaded, say appliances running at about 2 kW, but bad connections in the plug (loose terminal screw, or, with moulded plug, similar cases such as broken strands on crimps or brazing)




    In my box of souvenirs, I have a (moulded) 13 A plug which was fitted to a 3 kW heater and whose sleeving around the live pins has melted. I don't think that it was overloaded as such, but that it was not pushed all the way into the socket-outlet. Some arcing may have occurred.

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  • 0

    gkenyon:

    I've seen similar situations where the plug and socket-outlet are not overloaded, say appliances running at about 2 kW, but bad connections in the plug (loose terminal screw, or, with moulded plug, similar cases such as broken strands on crimps or brazing)




    In my box of souvenirs, I have a (moulded) 13 A plug which was fitted to a 3 kW heater and whose sleeving around the live pins has melted. I don't think that it was overloaded as such, but that it was not pushed all the way into the socket-outlet. Some arcing may have occurred.

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